Received 01 July 2013Accepted 10 November 2013Published online 22 November 2013

Acknowledgments:

This work was financially supported by the Ministry of Science and Technology of China through 973 Program (Nos. 2013CB632902-3, 2009CB623305, 2013CB6329052, and 2013CB632906), the Natural Science Foundation of China (Nos. 51332009, 51372258, 11304333, 61001041, 11090332, and 51272268), Science and Technology Commission of Shanghai Municipality (No. 12DZ0501000), Shanghai Rising-Star Program (No. 11QA1407500), Open Project from Shanghai Institute of Technical Physics, CAS (No. IIMDKFJJ-11-08), the Fund of Shanghai Institute of Ceramics (Nos. Y29ZC4140G and Y39ZC4140G), and Shanghai Municipal Electric Power Company (No. 52091413502W).